54 lines
1.5 KiB
PHP
54 lines
1.5 KiB
PHP
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<?php
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// Data base configuration and a bit more
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require_once ('config.php');
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define ('DB_CONFIG_TABLE', TAB_PREFIX . 'config');
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class DbUtils {
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/**
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* Open a PDO connection to the database based on the config.php file that
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* is written during the installation
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*
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* @return NULL|PDO: null if no connection could be established, otherwise the PDO instance
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*/
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public static function openDbAndReturnPdo() {
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$dsn = 'mysql:host=' . MYSQL_HOST . ';dbname=' . MYSQL_DB;
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$user = MYSQL_USER;
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$password = MYSQL_PASSWORD;
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$pdo = null;
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try {
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$pdo = new PDO($dsn, $user, $password);
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$pdo ->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
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}
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catch (PDOException $e) {
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return null;
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}
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return $pdo;
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}
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/*
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* To use sql strings that are easy to read the table names are used
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* without variables. But since the user can specify a prefix for all
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* tables the substitution must be done somewhere. This is the function
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* that replaces the %TABLE% by $prefix_table
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*/
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public static function substTableAlias($sqlString) {
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return self::substTableAliasWithPrefix($sqlString, TAB_PREFIX);
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}
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/**
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* Like substTableAlias, but can be used with a defined prefix
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*
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* @param unknown $sqlString
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* @param unknown $prefix
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* @return mixed
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*/
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public static function substTableAliasWithPrefix($sqlString,$prefix) {
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$out = $sqlString;
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$out = str_replace("%config%",$prefix . "config",$out);
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$out = str_replace("%clients%",$prefix . "clients",$out);
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return ($out);
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}
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}
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?>
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